0025748: Parallel version of progress indicator

Progress indication mechanism is refactored to support incrementing progress within multithreaded algorithms.

The class Message_ProgressIndicator is only an interface to the user application.
It accumulates the progress provided by progress scopes.
The counter is protected by mutex for thread-safety.

The new class Message_ProgressScope replacing Message_ProgressSentry should be used to advance the progress.
The scopes are nested to each other to reflect the nested nature of operations.
The new class Message_ProgressRange should be used to pass the progress to sub-scopes.

All OCCT algorithms involving progress indication have been updated to new API.

Improvements in Draw_ProgressIndicator:
- Separate console mode has been added in order to make possible to put the progress into std::cout instead
  or in addition to the draw interpreter, instead of trigger option "-tclOutput".
- Treatment of Ctrl-Break signal has been added.
  Now any operation can be aborted by Ctrl-C or Ctrl-Break keystroke.

Added new test case 'perf fclasses progr_par' for testing of parallel work of the progress.

tests/caf/progress/B2

@@ -11,7 +11,7 @@ puts "caf009-B2"
 set xDoc [CreateXmlDoc]
 
 # Configurate XProgress 
-XProgress -g +t -tcloutput
+XProgress +t 
 
 # Open xml document
 if {${xDoc} == "" } {
@@ -25,8 +25,9 @@ set output [Open ${xDoc} Doc]
 Close Doc
 
 # Test data
-set ctr {"0%" "Reading document" "Reading geometry" "3D Curves"
- "Surfaces" "Shapes" "Reading sub-tree" "100%" }
+set ctr { "0%" "Reading document" "Reading" "3D Curves" "2D Curves"
+          "3D Polygons" "Polygons On Triangulation" "Shapes" 
+          "Triangulations" "Surfaces" "Reading sub-tree" "100%" }
 
 foreach data ${ctr} {
     if ![regexp $data $output] {